Abstract
BACKGROUND: Hybrid corn varieties exhibit benefits associated with heterosis and account for most of the corn acreage in the USA. Hybrid seed corn is produced by crossing a female parent which is male-sterile and therefore incapable of self-pollination with a male parent as the pollen donor. The majority of hybrid seed corn is produced by mechanical detasseling which involves physically removing the tassel, a process that is laborious and costly. RESULTS: Glyphosate-resistant corn was developed via expression of a glyphosate insensitive 5-enolpyruvyl-shikimate 3-phosphate synthase enzyme (CP4-EPSPS). Experimentation with molecular expression elements resulted in selective reduction of CP4-EPSPS expression in male reproductive tissues. The resulting plant demonstrated sterile tassel following glyphosate application with little to no injury to the rest of the plant. Using (14)C-glyphosate as a marker, we also examined the translocation of glyphosate to the tassel via spray application in a track sprayer to simulate field application. The results allowed optimization of spray parameters such as dose, spray timing and target to maximize tassel delivery of glyphosate for efficient sterilization. CONCLUSION: The Roundup hybridization system (RHS) is a novel process for hybrid seed production based on glyphosate-mediated male sterility. RHS replaces mechanical detasseling with glyphosate spray and greatly simplifies the process of hybrid seed corn production.
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Claims 5
Claim · model-written summary
Expression element experiments selectively reduced CP4-EPSPS expression in male reproductive tissues.
- Taxon
- corn
Zea mays subsp. mayst0 - Organ / stage
- male reproductive tissuese0
- Gene
- CP4-EPSPSe0
- Outcome
- CP4-EPSPS expressione0
- Direction
- reductione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Experimentation with molecular expression elements resulted in selective reduction of CP4-EPSPS expression in male reproductive tissues.”
t0“corn”
Claim · model-written summary
After glyphosate application, the resulting corn plant had a sterile tassel.
- Taxon
- cornZea mays subsp. mayst0
- Organ / stage
- tassele0
- Treatment
- glyphosate applicatione0
- Outcome
- sterile tassele0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The resulting plant demonstrated sterile tassel following glyphosate application with little to no injury to the rest of the plant.”
t0“corn”
Claim · model-written summary
Glyphosate application caused little to no injury to the rest of the corn plant.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- glyphosate applicatione0
- Outcome
- injury to the rest of the plante0
- Direction
- little to noe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The resulting plant demonstrated sterile tassel following glyphosate application with little to no injury to the rest of the plant.”
t0“corn”
Claim · model-written summary
Glyphosate translocation findings enabled optimization of dose, timing and target to maximize delivery to corn tassels.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- tassel delivery of glyphosatee0
- Direction
- maximizee0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results allowed optimization of spray parameters such as dose, spray timing and target to maximize tassel delivery of glyphosate for efficient sterilization.”
t0“corn”
Claim · model-written summary
The Roundup hybridization system simplifies hybrid corn seed production by replacing mechanical detasseling with glyphosate spray.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- glyphosate spraye0
- Outcome
- process of hybrid seed corn productione0
- Direction
- greatly simplifiese0
- Comparator
- mechanical detasselinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“RHS replaces mechanical detasseling with glyphosate spray and greatly simplifies the process of hybrid seed corn production.”
The same questions in other papers
glyphosate · crop injury · Zea mays (maize)Positive and negative results
2 papers in the same direction as this paper · 14 in the opposite direction · 1 reporting no difference from an alternative
- negative
- negative
- negative
14 papers more in this group
See all 18 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.